115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* A simple JSON writer
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*
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* Copyright Alexander Graf
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*
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* Authors:
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* Alexander Graf <agraf@suse.de>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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/*
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* Type QJSON lets you build JSON text. Its interface mirrors (a
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* subset of) abstract JSON syntax.
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*
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* It does *not* detect incorrect use. It happily produces invalid
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* JSON then. This is what migration wants.
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*
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* QAPI output visitors also produce JSON text. However, they do
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* assert their preconditions and invariants, and therefore abort on
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* incorrect use.
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*/
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#include "qemu/osdep.h"
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#include "qapi/qmp/qstring.h"
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#include "migration/qjson.h"
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struct QJSON {
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QString *str;
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bool omit_comma;
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};
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static void json_emit_element(QJSON *json, const char *name)
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{
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/* Check whether we need to print a , before an element */
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if (json->omit_comma) {
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json->omit_comma = false;
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} else {
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qstring_append(json->str, ", ");
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}
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if (name) {
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qstring_append(json->str, "\"");
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qstring_append(json->str, name);
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qstring_append(json->str, "\" : ");
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}
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}
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void json_start_object(QJSON *json, const char *name)
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{
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json_emit_element(json, name);
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qstring_append(json->str, "{ ");
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json->omit_comma = true;
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}
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void json_end_object(QJSON *json)
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{
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qstring_append(json->str, " }");
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json->omit_comma = false;
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}
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void json_start_array(QJSON *json, const char *name)
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{
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json_emit_element(json, name);
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qstring_append(json->str, "[ ");
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json->omit_comma = true;
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}
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void json_end_array(QJSON *json)
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{
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qstring_append(json->str, " ]");
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json->omit_comma = false;
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}
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void json_prop_int(QJSON *json, const char *name, int64_t val)
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{
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json_emit_element(json, name);
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qstring_append_int(json->str, val);
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}
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void json_prop_str(QJSON *json, const char *name, const char *str)
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{
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json_emit_element(json, name);
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qstring_append_chr(json->str, '"');
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qstring_append(json->str, str);
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qstring_append_chr(json->str, '"');
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}
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const char *qjson_get_str(QJSON *json)
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{
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return qstring_get_str(json->str);
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}
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QJSON *qjson_new(void)
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{
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QJSON *json = g_new0(QJSON, 1);
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json->str = qstring_from_str("{ ");
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json->omit_comma = true;
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return json;
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}
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void qjson_finish(QJSON *json)
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{
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json_end_object(json);
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}
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void qjson_destroy(QJSON *json)
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{
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QDECREF(json->str);
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g_free(json);
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}
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